I just installed the Greddy SP2 exhaust and the Joe-Z intake. I really didn't want to disconnect the negative battery terminal because I didn't want to lose my nav address book. The thought of having to manually adding all my contacts again is something that I didn't want to do.

So my question is how important is it? Will the computer eventually learn of my new equipment and adjust its sensors accordingly after a few hundred miles, or is it necessary to disconnect to maximize efficiency?

TIA

 

You don't have to disconnect the battery.

Click here. It's from the FAQ.

 

the fuseeeeeeeeeee man the fuseeeeeeeeeee not the battery

 

I though reseting the EFI and ETCS fuses was only to get the car to re-learn the gear selection patterns? Lobux mentioned one would need to reprogram the actual ECM if they want the engine to "work right" after these kinds of mods.

 

It depends on the types of modifications. With all the custom exhaust work and intake work, I have had initially a few P0171 lean errors, but nothing since. However, I could get MORE out of them if I reprogrammed th ECM.

The computer eventually does learn, but as I said it can be improved with tinkering with the ECM.

 

can you reset the ECM without loosing everything???

 

You missed this post nrsk4u.

 

Keep in mind, the ECM can only modify the fuel values by a 20% correction. If you do mods that add more than 20% airflow, you'll be short on fuel unless you put in bigger injectors, and that brings its own set of issues.

To answer why you would reset the ECM - it restores the correction factors to zero and starts the learning process for the fuel maps all over again. Ideally, you'd be able to modify the base values in the map to take advantage of the places where your mod is working best, but Toyco doesn't give us the information we need to do this sucessfully.

 

Bastards!!! thanks for explaining that !!!

 

One of my future projects is a turbo and I plan to use some RC Injectors. I remember not too long ago a group out in Malaysia was able to extract about 10 hp, but no more, out a stock Toyota Harrier with an eManage, before they encountered some issues, among which was the fuel.

 

I'm not a big eManage fan. The people I know and trust have had some very bad experiences with them, mostly because they occasionally fail to load the ignition maps. The typical result is the engine detonating to death very quickly.

I've only known a couple of people who have had consistently good results with them.

 

They tend to be huge things here in Mexico as far as what is used for tuning other than chips (an 2x the price for the eManage), but even with chips they can be hit and miss and the 7,000 foot altitude plays all sorts of havoc.

We have a monthly bracket competition this Sunday I help run (and sometimes win, and within I would say the last two years, I have seen a profound increase in the number of people making adjustments with their hooked up laptops. After seeing the results on the track, some would be better off tuning via other means as it seems they look to the eManage or other as the solution to all their problems.